#include<stdio.h>
int main()
{
    printf(" enter\n");
    char c1;//每次马虎犯的错，基本上都在scanf()上!!!!!!
    scanf("%c",&c1);
    c1=(c1>='A'&&c1<='Z')?(c1+32):c1;
    printf("c1 is %c",c1);
    return 0;
}